US PATENT SUBCLASS 165 / DIG 349
.~.~ Supported by cover for tank

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 342  DD  TANK WITH HEAT EXCHANGER {5}
DIG 348  DD  .~ Heat exchanger within tank {4}
DIG 349.~.~ Supported by cover for tank